Unless we ______ now we can't be on time.

• will start
• start
• starts
• will be starting
Correct Option: B  [ start ]

Remark:

Sir, our list of grievances here ________ a long one.

• are
• were
• is
• was
Correct Option: C  [ is ]

Remark: "list" is a singular noun, and when referring to a singular entity, the verb should also be singular.

Most of the labourers _____________ on the strike.

• is
• has
• are
• have
Correct Option: C  [ are ]

Remark:

The furniture in this room _______ made of teak.

• are
• have
• is
• No correction
Correct Option: C  [ is ]

Remark: Furniture is an uncountable noun and is not used in the plural, so furniture is a singular subject.

The Prime Minister with all the members of his cabinet __________ arrived.

• is
• have
• has
• are
Correct Option: C  [ has ]

Remark:

Not only my parents but also I _______ regretting the change of school.

• are
• is
• am
• No option is appropriate
Correct Option: C  [ am ]

Remark: in case "Not only...but also" the verb should agree with the subject closest to the verb.

Everyone _______ at the party.

• dance
• dances
• are dances
• have dances
Correct Option: B  [ dances ]

Remark: "everyone" is considered a singular pronoun (subject), singular verb should be used.

The student, as well as his teacher ________ going on the excursion.

• have
• has
• were
• was
Correct Option: D  [ was ]

Remark:

Each of the students _______ given a task to complete.

• were
• was
• have
• have been
Correct Option: B  [ was ]

Remark: If a subject is modified by the words "each" or "every" that subject is singular and will take a singular verb.

One of the boys ________ been given a book.

• have
• are
• has
• were
Correct Option: C  [ has ]

Remark: "One of" is followed by "plural noun/pronoun" and "singular helping verb"